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A kind of barium-containing aluminophosphate cement

A technology of aluminate phosphate cement and calcium aluminate phosphate containing barium, applied in the field of cement materials, can solve problems such as mechanical properties gap, strong temperature sensitivity, strength shrinkage, etc., achieve outstanding mechanical properties in early and late stages, and improve early stage and later mechanical properties, the effect of setting time delay

Active Publication Date: 2017-12-26
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some shortcomings in the performance of this cement, such as: the shrinkage phenomenon in the later stage of strength; the ettringite in the hydration product is highly sensitive to temperature, and it is easy to decompose or transform and affect the stability of the matrix
Therefore, the sulphoaluminate series cement cannot meet the severe requirements under special service conditions.
[0003] Chinese patent CN 1498870A discloses a cementitious material of aluminophosphate system, which is a new type of high-performance hydraulic cementitious material, which is different from Portland cement, aluminate cement and sulphoaluminate cement, and has Good early and long-term mechanical properties, exceeding the strength of sulphoaluminate cement at the same age, but there is still a gap between its mechanical properties and special environmental service projects, and measures need to be taken to improve its mechanical properties; at the same time, the cement setting time is super fast (about 2- 5 minutes), it is necessary to develop a matching retarder

Method used

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  • A kind of barium-containing aluminophosphate cement
  • A kind of barium-containing aluminophosphate cement
  • A kind of barium-containing aluminophosphate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of aluminum phosphate cement, its raw material component weight percent is:

[0019] Barite tailings 10.4%

[0020] Bauxite 27.8%

[0021] Limestone 24.5%

[0022] Apatite 34.3%

[0023] Iron-rich steel slag 3.0%

[0024] Mix the raw material according to the design ratio, and calcine the raw material in the laboratory with a silicon-molybdenum rod electric furnace. The normal heating rate (10°C / min), the firing temperature is controlled between 1440-1450°C, and the holding time is 90min. .

[0025] The fired clinker is detected, and the mass percentage of each clinker mineral is:

[0026] Calcium aluminophosphate with barium 35.4%

[0027] Calcium aluminate 47.2%

[0028] Calcium Phosphate 12.2%

[0029] Vitreous 5.2%

[0030] The compressive strength of cement clinker: 1d is 89.0MPa, 3d is 104.1MPa, 28d is 152.2MPa. The initial setting is 120 minutes, and the final setting is 205 minutes. Such as figure 1 As shown, its XRD pattern shows that the bar...

Embodiment 2

[0032] A kind of aluminum phosphate cement, its raw material component weight percent is:

[0033] Barite tailings 10.7%

[0034] Bauxite 26.9%

[0035] Limestone 28.3%

[0036] Apatite 30.1%

[0037] Iron-rich steel slag 4.0%

[0038] Mix the raw material according to the design ratio, and calcine the raw material in the laboratory with a silicon-molybdenum rod electric furnace. The normal heating rate (10°C / min), the firing temperature is controlled between 1430-1440°C, and the holding time is 90min. .

[0039] The fired clinker is detected, and the mass percentage of each clinker mineral is:

[0040] Calcium aluminophosphate with barium 35.2%

[0041] Calcium aluminate 48.6%

[0042] Calcium Phosphate 11.2%

[0043] Vitreous 5.0%

[0044] The compressive strength of cement clinker: 1d is 110.4MPa, 3d is 120.5MPa, 28d is 158.7MPa. The initial setting is 115 minutes, and the final setting is 205 minutes. Such as figure 2 As shown, its XRD pattern shows that the b...

Embodiment 3

[0046] A kind of aluminum phosphate cement, its raw material component weight percent is:

[0047] Barite tailings 6.9%

[0048] Bauxite 28.4%

[0049] Limestone 29.2%

[0050] Apatite 30.5%

[0051] Iron-rich steel slag 5%

[0052] Mix the raw material according to the design ratio, and calcine the raw material in the laboratory with a silicon-molybdenum rod electric furnace. The normal heating rate (10°C / min), the firing temperature is controlled between 1450-1460°C, and the holding time is 90min. .

[0053] The fired clinker is detected, and the mass percentage of each clinker mineral is:

[0054] Calcium aluminophosphate with barium 39.4%

[0055] Calcium aluminate 45.6%

[0056] Calcium Phosphate 10.0%

[0057] Vitreous 5.0%

[0058] The compressive strength of cement clinker: 1d is 90.1MPa, 3d is 96.5MPa, 28d is 140.6MPa. The initial setting is 125 minutes, and the final setting is 210 minutes. Such as figure 1 As shown, its XRD pattern shows that the barium-co...

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Abstract

The invention discloses barium-containing phosphoaluminate cement. The barium-containing phosphoaluminate cement is obtained after direct grinding of cement clinker, wherein the cement clinker comprises mineral components in percentage by weight as follows: 35.2%-39.4% of barium-containing calcium phosphoaluminate, 45.6%-48.6% of calcium aluminate, 10.0%-12.2% of calcium phosphate and 5.0%-5.2% of glass. The barium-containing phosphoaluminate cement has prominent early-stage and later-stage mechanical performance, can be made into high-performance special concrete with early strength and later strength continuously developing and is used for special engineering construction; secondarily, compared with 2-5 min rapid setting time of pure phosphoaluminate cement, the rapid setting time of the barium-containing phosphoaluminate cement exceeds 100 min, adjustment can be performed according to demands of special engineering, and the barium-containing phosphoaluminate cement can be directly used for the engineering under the condition that a set retarder is not additionally added.

Description

technical field [0001] The invention relates to a cement material, in particular to a barium-containing aluminophosphate cement. Background technique [0002] Traditional Portland cement is the largest building material and has played an important role in the development of the national economy. But for some construction projects serving in special environments, such as the construction and protection of military projects, coastal projects, island and reef projects, etc. Traditional Portland cement has been far from meeting the stringent requirements of projects under these special service conditions for rapid hardening and early strength, outstanding long-term mechanical properties, corrosion resistance, frost resistance, and carbonation resistance. At present, the output of special cement in my country is less than 2% of the total output of cement, while the output of special cement in developed countries accounts for about 6-10% of the total output of cement. Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/02
CPCC04B12/025C04B7/32C04B7/14C04B7/147
Inventor 芦令超杨帅王守德宫晨琛程新
Owner UNIV OF JINAN